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Degradation characteristics of Mg0.8Ca in saline solution with and without albumin protein investigated by electrochemical impedance spectroscopy
Author(s) -
Crimu C.,
Bolat G.,
Munteanu C.,
Mareci D.
Publication year - 2015
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201407980
Subject(s) - dielectric spectroscopy , alloy , materials science , scanning electron microscope , energy dispersive x ray spectroscopy , electrochemistry , chemical engineering , analytical chemistry (journal) , metallurgy , chemistry , composite material , chromatography , electrode , engineering
Biodegradable magnesium–calcium (MgCa) alloy is a very attractive biomaterial. Binary Mg0.8Ca alloy was fabricated. X‐ray diffraction (XRD) analysis and optical microscopy observed showed that Mg0.8Ca alloy was composed of α(Mg) phase. The electrochemical impedance spectroscopy (EIS) technique was used for the study on the degradation characteristics of Mg0.8Ca alloy. Because the proteins have a role on the passivation of metals, the effect of albumin protein addition in NaCl solution on the electrochemical behaviour of Mg0.8Ca alloy was studied. It has been shown that in 0.9 wt% NaCl solution the impedance was mainly characterised by one capacitive and one inductive effect, which related to the alloy charge transfer reaction and the relaxation of the absorbed corrosion compounds. The addition of 37.5 mg/mL albumin protein to 0.9 wt% NaCl solution increased the impedance compared to that without albumin protein. The equivalent circuits simulating the electrochemical behaviour of Mg0.8Ca alloy in 0.9 wt% NaCl solution with and without albumin protein were proposed. The surface morphology of the Mg0.8Ca samples after 1‐week immersion in Mg0.8Ca alloy in 0.9 wt% NaCl solution with albumin protein was studied using scanning electron microscopy (SEM). The electrochemical mechanism for degradation of Mg0.8Ca alloy in 0.9 wt% NaCl solution is related to the albumin protein addition.